Peripheral Nervous System (Part 2) Flashcards Preview

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Flashcards in Peripheral Nervous System (Part 2) Deck (31):
1

Mature neurons do not

divide

2

Damage to what causes the death of a neuron

the cell body

3

In Peripheral nerves, damaged axons

can successfully regenerate and new axons can grow 1-5 mm/day

4

Damaged axons in the peripheral nerves break down by

Wallerian degeneration (breaks down distally from injury site)

5

In peripheral nerves, the growth of axons can

be blocked by other tissues and thus stop regeneration

6

In the CNS axons, in reference to regeneration

do not regenerate more than 1mm

7

In the CNS axons, the growth of axons may be

able to reroute the nerve pathway

8

How many pairs of cranial nerves are there

12

9

Name the nerves with their numbers

1-Olfactory
2-Optic
3-Oculomotor
4-Trochlear
5-Trigeminal
6-Abducens
7-Facial
8-Vestibulocochlear
9-Glossopharyngeal
10-Vagus
11-Accessory
12-Hypoglossal

10

From the cerebrum to the upper nasal tract; sensory only for smell

Olfactory Nerve

11

from cerebrum to eyes; sensory only for vision

Optic nerve

12

what does the oculomotor nerve do

moves eyes and eyelid

13

What does the Trochlear nerve do and what is special about it

moves eye; the smallest cranial nerve

14

What does the Trigeminal nerve do and what makes it special

sensory (eyes, forehead, and mouth) and motor (chewing); largest cranial nerve

15

What does the Abducens nerve do

Abducts eyes (turns them laterally)

16

What does the facial nerve do

both sensory (taste) and motor (facial muscles, tear and salivary glands)

17

What does the Vestibulochochlear nerve do

Sensory only ( hearing and dynamic equilibrium)

18

What does the Glossopharyngeal nerve do

Sensory (mouth and taste) and motor (swallowing)

19

What does the Vagus nerve do

From Medulla Oblongota to chest and abdomen (motor)
~somatic= speech and swallowing
~autonomic= controls heart and abdominal smooth muscle

20

What does the Accessory nerve do

Motor (muscles in the neck and back)

21

What does the Hypoglossal nerve do

Motor (tongue for chewing, swallowing and speaking).

22

How many spinal nerves are there

31 pairs along the spinal cord, they are mixed nerves (sensory and motor)

23

What is the break down of the spinal nerves

8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal

24

What is the purpose of the spinal nerves

They transmit impulses between the spinal cord and the rest of the body

25

Each nerve of the spinal cord emerges from a

dorsal and ventral root

26

A dorsal root contains

sensory fibers and a dorsal root ganglion

27

A ventral root contains

contains motor fibers

28

What are the components of a reflex arc

1). Receptor- site of stimulus action
2). Sensory Neuron- transmits the afferent impulses to CNS
3). Integration Center- brain or spinal cord
4). Motor Neuron- Transmits effernt impulses from CNS to effectors
5). Effector- Muscles or glands that respond to efferent impulses

29

What are the two types of reflex activity

Somatic and Autonomic

30

The somatic reflexes activates

skeletal muscles (stretch reflex and patellar reflex)

31

The autonomic reflex activates

Smooth or cardiac muscles or glands (ciliospinal and papillary reflex)